and when I restart I got an screen more or less as the print screen attached. Any idea ?

Answer:

One thing is sure: The rainbow screen means the GPU firmware is loaded, but there is a problem with the kernel image. Which one? Impossible to say from here. Perhaps not found or corrupt. Might be that the kernel you got from www.nordicsemi.com is broken. Might be you have a typo somewhere. But it can also be a faulty SD-card. Or a wrong power supply. According to Google:

In some cases (Stuck on the Rainbow Screen), freezing at this point has been fixed by adding "boot_delay=1" to the config.txt file.

If nothing helps, you probably have to go back to the default Raspian kernel. If you need a more recent kernel than in the default Raspian, you can switch to Raspian testing. The testing kernel should be a bit more recent... and definitely works for me.

Error ACT LED patterns While booting the ACT LED should blink in an irregular pattern, indicating it is reading from the card. If it starts blinking in a regular (Morse code like) pattern then it is signaling an error.

When it blinks just once: possibly you have a Rpi from Micron. Take a good look at the processor if it says M with an orbit around it, then using the latest software ( after Sept 2013 ) will solve your problem. Also make sure you have a 4Gb SD card: a 2Gb doesn't work in this particular case.

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